Geomorphology of Martel inlet, King George Island, Antarctica: a new interpretation based on multi-resolution topo-bathymetric data

Abstract This study investigated the terrestrial and submarine geomorphology and glacial landform records in the Martel inlet (King George Island) using a multi-resolution topobathymetric data based on seismic, multibeam surveys and terrestrial satellite datasets (REMA DEM). Geomorphometric analysis...

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Bibliographic Details
Published in:Anais da Academia Brasileira de Ciências
Main Authors: CLEIVA PERONDI, KÁTIA KELLEM DA ROSA, ROSEMARY VIEIRA, FABIO JOSÉ GUEDES MAGRANI, ARTHUR AYRES NETO, JEFFERSON C. SIMÕES
Format: Article in Journal/Newspaper
Language:English
Published: Academia Brasileira de Ciências 2022
Subjects:
Antarctic fjord
submarine landform
multibeam bathymetry
glacier forelands
palaeoglacial history
Science
Q
Antarctic
King George Island
Martel
Martel Inlet
Dobrowolski
Antarc*
Antarctica
Online Access:https://doi.org/10.1590/0001-3765202220210482
https://doaj.org/article/1cbe57bdcfbd496f8e3390ebf1c81636
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Summary:Abstract This study investigated the terrestrial and submarine geomorphology and glacial landform records in the Martel inlet (King George Island) using a multi-resolution topobathymetric data based on seismic, multibeam surveys and terrestrial satellite datasets (REMA DEM). Geomorphometric analysis provided glacial landforms and sedimentary processes interpretation. The submarine sector has a mean depth of 143 m, a maximum depth of 398 m, and most of it has a low slope (0°–16°). Steep slopes (>30°) are found along the mid-outer sectors transition area. The continental shelf was divided into inner fjord (49 m depth), middle fjord (119 m), and outer fjord (259 m), based on depth, elevation and slope. The topobathymetric digital model provides evidence of geomorphological contrasts between these zones in the fjord’s seafloor and subaerial environments. A prominent morainal bank in the transition between the inner and middle parts marks the limit of a past stationary stage of the Dobrowolski-Goetel ice margin. Streamlined glacial lineations demonstrate an NE-SW past ice flow direction and a wet-based thermal regime. The combined analysis of submarine and subaerial landforms enable the understanding of the former glacier configuration and its deglaciation history.

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